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SQL: SELECT statement

I am (attempting) to create a php/mysql/flash shopping cart.. and having a small prob with a select statement. The problem is (I think), I am joining 9 tables.. but not every product has information stored in every table..

for example:

Product A has a color, a range, and a category... but it doesnt have a size.. whereas other products might have a size.. all products have a range and category.. but not all have a color and a size..

With that said.. my select statement only produces a result if the product has a color and a size.. if it doesnt.. then i get an empty set.